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| Numerical analysis on influence of guide vanes on performance of centrifugal pump acting as hydraulic turbine |
| Yang Junhu, Gong Zhaohui, Xia Shuqiang, Luo Kaikai, Li Hailong |
| School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China |
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Abstract In order to study the effects of guide vanes on the performance of a centrifugal pump acting as hydraulic turbine, CFD software was adopted to simulate the flow field of the pump as turbine which was designed with and without guide vanes. The results show that guide vanes could improve the efficiency, increase the flow rate at the best efficiency point and decrease the required pressure head. Internal flow field analysis shows that the velocity field is improved, and the number of vortexes as well as the size decreases. The static pressure distributions at the inlet of impeller increases. The analysis of velocity moment distribution shows that the variation amplitude of velocity moment with guide vanes is smaller, and symmetrical distribution and smooth change of velocity moment can be found on the ring surface of impeller inlet. When the number of guide vanes is eleven, the variation amplitude of velocity moment is the lowest. With the guide vanes, the injection conditions of impeller and the operation stability are improved.The results are instructive to the optimization design of pumps as turbines.
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Received: 28 January 2013
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| [1]Tarang Agarwal.Review of pump as turbine(PAT)for micro-hydropower [J]. International Journal of Emerging Technology and Advanced Engineering,2012,2(11):163-169.[2]Himanshu Nautiyal,Varun,Anoop Kumar,et al. Experimental investigation of centrifugal pump working as turbine for small hydropower systems [J].Energy Science and Technology, 2011,1(1):79-86[3]Ron Adams,John Parker. Reducing pressure-increasing efficiency [J].Sulzer Technical Review,2011(1):26-29.[4]Pradeep Bansal,Nick Marshall. Feasibility of hydraulic power recovery from waste energy in biogas scrubbing processes[J]. Applied Energy,2010,87(3):1048-1053.[5]Derakhshan S,Nourbakhsh A. Experimental study of characteristic curves of centrifugal pumps working as turbines in different specific speeds [J]. Experimental Thermal and Fluid Science,2008,32(3):800-807.[6]Williams A A. The turbine performance of centrifugal pumps: A comparison of prediction methods [J]. Journal of Power and Energy, 1994,208(1):59-66.[7]杨军虎,袁亚飞,蒋云国,等.离心泵反转作为能量回收透平的性能预测[J].兰州理工大学学报,2010,36(1):54-56. Yang Junhu,Yuan Yafei,Jiang Yunguo,et al.Perfor-mance predictions of reversed centrifugal pumps working as energy recovery turbines[J].Journal of Lanzhou University of Technology,2010,36(1):54-56.(in Chinese)[8]Singh P, Nestmann F. An optimization routine on a prediction and selection model for the turbine operation of centrifugal pumps [J]. Experimental Thermal and Fluid Science, 2010, 34(2):152-164.[9]杨军虎,王晓晖.叶片形状对能量回收水力透平性能的影响[J].排灌机械工程学报,2011,29(4):287-291. Yang Junhu,Wang Xiaohui.Effect of vane profile on hydraulic energy recovery turbines performance [J].Journal of Drainage and Irrigation Machinery Engineering,2011,29(4):287-29.(in Chinese)[10]杨孙圣,孔繁余,薛玲,等. 长短叶片对液力透平性能的影响[J].农业机械学报,2012,43(7):104-107. Yang Sunsheng,Kong Fanyu,Xue Ling,et al. Effect of splitter blade on the performance of pump as turbine [J]. Transactions of the Chinese Society for Agricultural Machinery, 2012,43(7):104-107.(in Chinese)[11]Fernandez J, Blance E,Parrondo J,et al. Performance of a centrifugal pump running in inverse mode[J]. Journal of Power and Energy,2004,218(4):265-271.[12]盛树仁. 利用水泵逆转及水轮机回收能量的研究[J]. 流体工程,1984(6):22-29. Sheng Shuren. Research of the energy recovery with inverse operational pump and turbine[J]. Fluid Enginee-ring, 1984(6): 22-29.(in Chinese) |
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